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4 Forces, density and pressure
4.1 Turning effects of forces
Candidates should be able to:
1 understand that the weight of an object may be taken as acting at a single point known as its centre of
gravity
2 define and apply the moment of a force
3 understand that a couple is a pair of forces that acts to produce rotation only
4 define and apply the torque of a couple
4.2 Equilibrium of forces
Candidates should be able to:
1 state and apply the principle of moments
2 understand that, when there is no resultant force and no resultant torque, a system is in equilibrium
3 use a vector triangle to represent coplanar forces in equilibrium
Cambridge International AS & A Level Physics 9702 syllabus for 2025, 2026 and 2027. Subject content
Back to contents page www.cambridgeinternational.org/alevel 19
4.3 Density and pressure
Candidates should be able to:
1 define and use den
